Level in psycho acoustics as subjectivly perceived loudness (volume)
The vague human feeling of the double loudness (volume) is specified
with about 6 to 10 dB. This personal feeling is not an exactly measurable value.

Mp3 Gain 4 7 0 5 X 4

Conversion Factor, Ratio, or Gain to a Level Value (Decibels dB)
Amplifier conversion – Convert decibels to voltage gain / loss
Calculator Voltage Gain – Voltage Loss and Power Gain – Power Loss

Conversion: Gain G, Voltage ratioAV, and Power ratioAP

Voltage gain in dB


Power gain in dB

Voltage ratio = amplification factor (voltage)
Power ratio = amplification factor (power)
V1 = Vin and V2 = Vout.
V2 > V1 or Vout > Vin means amplification. The dB value is positive. (+)
V2 < V1 or Vout < Vin means damping. The dB value is negative. (−)
V2/V1 or Vout/Vin means the ratio. The amplification or the damping in dB is:
L = 20 × log (voltage ratio V2 / V1) in dB. V1 = Vin is the reference.


The word 'power amplifier' is a misnomer - especially in audio engineering.
Voltage and current can be amplified. The strange term 'power amplifier' has
become understood to mean an amplifier that is intended to drive a load such
as a loudspeaker.
We call the product of current gain and voltage gain 'power amplification'.



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MP3 Gain 4.5.0

MP3 Gain for mac is a simple tool designed specifically to adjust and normalize the volume of audio(mp3, wma, etc) files. It automatically normalize the volume of audio files and adjust the loudness of audio tracks without lossy. It performs statistical analysis to determine how loud the file actually sounds to the human ear.
Key feature:
Note: NOT support DRM protected audio files.
What’s New:
Version 4.0.0
Mp3 Gain 4 7 0 5

Screenshots